Feeding mechanism for sewing-machines.



L. ONDERDONK.

PEBDING MBGHANISM FOR SEWING MACHINES.

APPLICATION FILED SEPT. 10,1907. .1,1 29,591 Patented Feb.23, 1915.

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L. ONDBRDONK. PBEDING MEGHANISM FOR SEWING MACHINES.

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LANSING-V ONDERDONIL OF NEW YORK, N. Y., ASSIGNOR DO UNION SPECIALMACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FEEDING iiEc-HANISMFOB, sEwINMAcmNEs To all inkom it may concern.' v

Be it known that I, LANSING ONDIAR- Donn a citizen of the United States,residing ath-New .York city, -in the county of New `York, State of NewYork, have inventedv certain new and useful Improvements in.

Feeding Mechanism for Sewing-Machines, of which the following is adescription, ref- Ierence being had to the accompanying drawing, and tothe letters and figures of reference marked thereon.

My invention relates to new and useful improvements in feedingmechanisms for sewing machines, and has for its objectto provide afeeding mechanism which shall operate rapidly while in engagement withthe material and which shall be positive in its movements.

My invention isespecially-adapted for usefin connection with sewingmachines having a work' supporting post, although from certain aspects,the invention is adapted foruse in connection withany type of sewingmachines.

My invention conslsts 1n the parts, ar-

rangements' and improvements hereinafter sectional view of a worksupporting post,-

showing my improved feeding mechanism in side elevation, certa-in partsof the machine being omitted for the sake of clearness; Fig. 2 is asectional view showing-the feeding mechanism as viewed from the front ofthe mach-ine; Fig. 3 is a top plan view showing a work supporting postand the -feed dogs, together with their carrier in top plan view; Fig. 4is a detail of the feed regulating mechanism; Fig. 5 is a detail of theneedleand feed dog. f

The bed plate l 'has mounted on its forward end a work supporting post2upon which the material rests, during the sewing` operation. he shaft 3,mounted in the work support 1, is rotated continuously from any suitablemeans as for example, an upper rotary shaft such as shown in theapplications above referred to. This shaft 3, extends through'a bearing4 and carries upon its forward end suitable eccentrics for operating thefeeding mechanism. The feeding spemeation of Letters Patent.

Patented Feb. 23, 1915.

Application led September 10, 1907. Serial No. 392,209.

i mechanism comprises a feed bar 5, which is pivoted at its lower end 6to a yoke7, which is in turn pivoted at 8 to the bed plate of themachine. Said yoke 8, carries an. arm

-9, which is secured thereto by screws 10 and 11. The yoke 7, rests onthe upper side of an eccentric 12, carried on the outer end of the shaft3L The arm 9 extends underneath the eccentric 12, and by means of thescrew 10, may bev adjusted so as to be brought closely' in contact withsaid eccen tric 12. f

The feed bar 5 is pivoted intermediate its ends at 13 to a link 14,which in turn is piv. oted at 15 to a lever 16 which at its lower end,encircles an eccentric 1 7, mounted on the shaft 3. Said lever 16,intermediate its ends, is pivoted at 18 to aglink 19, which in turn ispivoted to a rock lever 20, at 19 mounted between the brackets 21,21preferably formed integral with the work supporting post 2 (see Fig. 2).ASaid rock lever 20 is secured to said brackets by a pivot bolt 23.bracket 24 secured to the exterior portion of the work supporting post2, has pivoted thereto `a feed controlling arm 25. Said arm is pivotedto said bracket at 26 and carries a -thumb nut 27, which is threaded .onthe outer end of said arm 25.

'The bracket 24 .is provided with an outwardly extending portion 28,having its Aouter face formed concentrically with the' pivot 26 of theregulating 'arm 25. washer, orclamping plate 29 is mounted on the outerendof saidarm 25, and extends over the projectin portion 28 of thebracket 24. As the thum nut 27 is turned down, the washer 29 is broughtinto gripping contact with the portion 28 ofthe bracket andtheregulating arm thereby held in its adjusted position. The regulatingarm 25 is connected by means of a link 30 to-the rock lever 20. The feedbar 5 has formed integral therewith at its upper end arms 31 and 32which project voutwardly and upwardly 'forming a'yoke which supports atits upper end a feed dog carrier 33, carrying feed dogs 34., 35. Saidfeed dog carrier is secu'red to said yoke by suitable screws 3e, 37. I

lVhile I have shown two feed dogs in the present illustration of .myinvention, it is obvious that a single feed dog may be used n in lieuthereof. By providing the feed bar with the yoke which supports the feeddogs, I form a clear space for mounting the loopers which coperate withthe needles. AThe looper mechanism however, has been omitted for thesake of clearness. As the shaft 3 rotates, the eccentric 12 will causethe yoke 7 to oscillate about 'its vpivot 8 and in turn give to the feedbar a rising and falling movement. i 1

The eccentric 17 will cause the lever 16 to swing back and forth aboutthe pivot 18 and also to raise and lower about the pivotal support 19 ofthe link 19 and these movements of the lever 16 through the link 14 willcause the feed bar 5 to move bac and forth.

The operation of my feeding mechanism is as followsz'The eccentric 12 isso set on the main shaft relative to the eccentric 17, that the feed dogis practically raised into engagement with the material, for the purposeof feeding the same before the eccentric 17 operates through the lever16 to' move the feed dog to give thereto its feeding movements. 4As theeccentric 12 is rotated,

the yoke 7 will be oscillated about its center 8.

The tendency of the upward oscillation of `the yoke 7 about the center 8is to move the lower end of the feed bar 31 to the right,

as viewed in Fig. 1. At the same time, however, that the 4feed bar 31 is4raised by said yoke, the link 14 is turned about its Apivot center 15,and the resultant movement in the feed bar is practically a bodilymovement upward and slightly toward the front of the machine, intoengagement with the material. As soon as the feed dog engages thematerial, the same is moved by the eccentric 17 to feed the work. Thereare three essential elements which coperate in giving to the feed dogits feeding movements: First, the eccentric 17 as it rotates with theshaft 3, tends to move the lower end of the lever 16 tothe right,swinging the same about its fulcrum oint 18. This movement of the lever16 will give to the feed dog a slight feeding movement. Second, as thelever 1G is lifted by means of the eccentric 17, the link 19 is swungabout its pivotal point 19', which carries the upper en of the lever 16to the left, as viewed in Fig. 1, also giving to the feed dog amovementl to feed the fabric. lThird, as the lever 16 is lifted by theeccentric 17, the link 14 is turned about the pivot 13, and this turningof the link 13, owing to the fact that the feed bar is practicallystationary vertically at this time will tend to move the feed dog togive still additional movement to4 said feed dog. These three activeelements in the movement of the feed dog combine to .give to said feeddog a very quick feeding When it is desired to regulate the length ofthe feeding stroke, the thumb nut 27 is loosened and the regulating arm25 raised or lowered, and as the pivotal connection between the link 30and the arm 25 is eccentric to the pivotal support 26 of said arm 25,the rock lever 20, will be moved about its pivotal support 23, and theposition of the pivotal support 19 of the link 19 shifted. This shifting0f the pivotal support 19', will change the effective throw of theeccentric 17, and give, therefore, to the feed dog a greater or lessermovement to feed the material. v

By the above arrangement of parts for operating my feed dog, I haveprovided a feeding mechanism which operates very quickly. Furthermore,said feeding mechanism does not begin its feeding operation until theneedle 37 is well above the work plate, as shown in Fig. 5, wherein theextreme upper stroke of the needle is shown in dotted lines .and saidfeed dog completes its feeding movement, as shown in dotted lines insaid figure, by the time the needle has moved from the position shown infull lines in said figure, to the eXtreme upper end of its stroke andback again to the full line position.

Tn one embodiment of my invention where length of the stitch desired`while the needle was moving from a position ,1- ofan inch from itshighest point to its highest point and returning t0 a position of aninch below its highest point. This feeding of the fabric while theneedle is well above the work support, allows me to operate upon verythick material or to pass over heavy seams or the like in the materialoperated upon.

Having thus particularly described my invention,what I claim as new anddesire to secure by Letters Patent is 1. The combination with a bedplate and a. work-supporting post extending vertically from one endthereof, of a feeding mechanism located in the work-supporting postincluding,r `a feeding member, means for moving said feeding member upand down, and means for moving the same laterally comprising a lever, alink pivotally connected at one end to said lever and at its other endto said feeding member, means for vibrating said lever and a. swingingfulcrum for said lever.

The combination with the bed plate and a work supporting post extendingvertically from one end thereof of a feeding mechanism located in thework supportingv post, including in combination a 'feeding member, meansfor moving. said feeding member up and down, and means for moving thesame laterally comprising a lever, means for connecting said lever tosaid feeding member, means for vibrating said lever, a swinging fulcrumfor said lever, a pivotal support ltherefor, and means for shifting theposition of .the pivotal support of said swinging fulcrum.

3. The combination with the bed plate and a work 4supporting postextending vertically from one end'thereof; of a feeding mechanismlocated in the Work supporting post,V

including in combination a feeding member, means for raising andlowering the same, means for moving'the same laterally. comprising alever, a link connecting one end of said lever to said feeding member,means for vibrating said lever and a swinging fulcrum for said lever.

4. The combination with the bed plate and a. work supporting postextending vertically from one end thereof, of a feeding mechanismlocated in the Work supporting post including in combination a feedingmember, means for raising and lowering the same, means for moving thesame laterally, comprising a lever, a link connecting one end of saidlever to said feeding member, means for' vibrating said lever and aswinging fulcrum for said lever,`and means for shifting 6'. Thecombination with a bed plate of a,I

work supporting post extending vertically from one end'thereof, afeeding member located in the work supporting post, means connected tothe lower end of said feeding Vmember for raising and lowering the same,means for .moving said member laterally comprising a lever, means forvibrating said lever and a link pivotally connected at one end to saidlever and at its other end to said feeding member, and a. shiftingfulcrum for said lever.

7 The combination of a work supporting ,ser

post, a .feeding member located therein,

means connected to the lower end of said feeding member' for raising andlowering ythe same, means for moving said member laterally, comprising alever, means for vibrating said lever and a link connecting said leverto said feeding member, a shifting fulcrum'for said lever, a pivotalsupport for said shifting fu-lcrum, and means for varying the positionof the pivotal support for said shifting fulcrum.

8. .T he combination of a vertical work supporting post, a feedingmember extending longitudinally thereof, a main shaft extending beneathsaid post, a yoke pivoted to said feeding member at its lower end andpivoted tothe bed plate of the machine, an eccentric carried by saidshaft for vibrating said yoke and means for moving said feed memberlaterally.

9. The combination of a vertical work supporting post, a feeding memberextending longitudinally thereof, a main shaft extending beneath saidpost, a yoke pivoted to said feeding member at its lower end and pivotedto the bed plate of the machine, an eccentric carried by said shaft forvibrating l 10. The combination of a. work supporting v post, a feedingmember located therein, a main shaft, a yoke pivoted to said feedingmember at its lower end, an eccentric carried by said shaft forvibrating said yoke, a lever supported within said post, means forconnecting said lever to said feed member, means for vibrating saidlever and a shifting fulcrum for said lever.

l1. The combination of a work support-` A ing post, a feeding memberlocated therein,

a. main shaft, a yoke pivoted to said feeding member at its lower end,an eccentric carried by said shaft for vibrating said yoke, a leversupported withinsaid post, means for connecting said lever to said feedmember, means for vibrating'said lever, a shifting fulcrum for saidlever, and means for adjusting the pivotal support of said shiftingfulcrum.

12. sewing machine including in combination a work supporting post, afeeding member located therein, a main shaft, a yoke pivotally supportedbeneath said work supporting post, means for connecting said voke tosaid feeding member, an eccentric carried .by said shaft for vibratingsaid yoke, a lever, means for connecting said lever to said feedingmember, means for vibrating said lever, a link pivoted to said leverbetween its ends, a rock lever to which said link is pivoted and meansfor adjusting said rock lever and holding the same in its adjustedpositions.

13. A sewing machine including in combination a work supporting post, afeeding justed positions.

14. A sewing machine including in combination a bed plate, a worksupport rising therefrom, a feeding member within said work support,means for operating said feeding member, and means for regulating thethrow of said feeding member including a rock lever, a bracket securedto said work supporting post, a regulating arm pivoted to said bracket,and a link betweensaid reg'- ulating arm and said rock lever. j

l5. A sewing machine including in combination a bed plate, a worksupport rising therefrom, a feeding member within said work supportingmeans for operating said feeding member, means for regulating the throwof said feeding member, including a rock lever, a bracket secured tosaid work supporting post, a regulating arm pivoted to said bracket, alink between said regulating arm and rock lever, a clamping nut carriedby said regulating arm, and cooperating with said bracket for holdingthe same inl adjusted positions.

16. A sewing machine including in combination a bed plate, a worksupporting post rising therefrom, feeding mechanism within said worksupporting post, means for regulating the throw of said mechanisms,comprising a bracket secured to said Work supporting post, and having aprojection extending therefrom, a regulating arm piv-` loted to saidbracket, a clamping collar mountedon said arm and extending over mea-aarsaid projection, and a clamping screw for forcing said clamping collarinto contact with said projection. v

17. A sewing machine including in cornbination a, work support, avertically arranged feeding member located beneath said work support, alever extending substantially parallel with said feeding member formoving said feeding member back said work support, a lever extendingsub- Y stantially parallel with said feeding member for moving saidfeeding member back and forth, a. swinging link on which said lever isfulcrumed, a link between said feedingy member and said lever, and meansfor operating said lever to swing the same about its fulcruln on saidlink and also to swing said link carrying the fulcrum of said lever, andmeans for raising and lowering said feed member.

19..A feeding mechanism comprising a. substantially vertical feed barcarrying a feed dog on the upper end thereof and means for moving thefeed bar laterally at the end thereof adjacent the feed dog for givingfeeding movements tothe feed dog, means for moving the feed barlongitudinally for causing the feeddog-to engage the, fabric, said lastnamed means including a yoke pivoted at one end to the bed plate of themachine and at its other end to the lower end ofthe feed bar, and aneccentric for engaging and oscillating said yoke.

ln testimony whereof l affix my signature, in presence of two witnesses.

LANSING ONDERDONK.

l W'itnesses:

WALTER HARTLEY, FRANKLIN H. CHILTON.

